London Zoo reveals winners of the ZSL Animal Photography Prize 2012

Category 3 Size Matters, Junior Winner: Frog on a Leaf by Bex Saunders. Junior photographer Bex Saunders said: "I picked this image because I've always been fascinated by frogs, but most people I know really dislike them. When I first saw the frog on the leaf, I thought about how cute it was and I wanted to capture that to show others how beautiful frogs are. I was also struck by the size of it: I could have easily fit it on my thumb as it was so small!"Picture: Bex Saunders / ZSL